ADSORPTION OF PAIRWISE INTERACTING ATOMS - ON THE DERIVATION OF THE INTERACTION PARAMETERS BETWEEN 1ST AND 2ND NEIGHBORS FROM EXPERIMENTAL-DATA

被引:9
作者
JAGER, I
机构
[1] Institut für Metallphysik, Montanuniuersität
关键词
D O I
10.1016/0039-6028(91)90662-C
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Atoms adsorbed on surfaces usually interact quite strongly among each other. This leads to well-known long-range-order structures such as c(2 x 2) or p(2 x 2). The phase boundaries of these phases may be calculated if the interaction energies are known. The reverse conclusion is generally not possible except if the range of interactions is confined to nearest neighbors, which, however, is unrealistic. In this contribution the results of Monte Carlo calculations on 2-dimensional Ising antiferromagnets with pairwise interactions between first and second neighbors are applied in such a way as to permit the derivation of first and second neighbor interactions from easily measurable data, viz. the maximum temperatures of the reversible onset of long-range-order of two phases. Since under the assumption of a rigid square lattice of adsorption sites and repulsion between nearest neighbors two easily identifiable phase transitions exist for any value of second-neighbor interaction the results provide a valuable tool for the simple derivation of interaction energies between first and second neighbors.
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收藏
页码:300 / 308
页数:9
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